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Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics

Hinterstein, Manuel and Schmitt, Ljubomira A. and Hoelzel, Markus and Jo, Wook and Rödel, Jürgen and Kleebe, Hans-Joachim and Hoffman, M. (2015):
Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics.
In: Applied Physics Letters, pp. 222904(1-5), 106, (22), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4922145],
[Article]

Abstract

In this study, the evolution of field induced mechanisms in lead-free piezoelectric ceramics (1−x)Bi1/2 Na 1/2TiO3-xBaTiO3 with x = 0.06 and 0.07 was investigated by transmission electron microscopy, neutron, and X-ray diffraction. Preliminary investigations revealed a strong degradation of macroscopic electromechanical properties within the first 100 bipolar electric cycles. Therefore, this structural investigation focuses on a comparative diffraction study of freshly prepared, poled, and fatigued specimens. Transmission electron microscopy and neutron diffraction of the initial specimens reveal the coexistence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively. In situ electric field X-ray diffraction reveals a pronounced field induced phase transition from a pseudocubic state to a phase composition of significantly distorted phases upon poling with an external electric field of 4 kV/mm. Although the structures of the two compositions are pseudocubic and almost indistinguishable in the unpoled virgin state, the electric field response shows significant differences depending on composition. For both compositions, the application of an electric field results in a field induced phase transition in the direction of the minority phase. Electric cycling has an opposite effect on the phase composition and results in a decreased phase fraction of the minority phase in the fatigued remanent state at 0 kV/mm.

Item Type: Article
Erschienen: 2015
Creators: Hinterstein, Manuel and Schmitt, Ljubomira A. and Hoelzel, Markus and Jo, Wook and Rödel, Jürgen and Kleebe, Hans-Joachim and Hoffman, M.
Title: Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics
Language: English
Abstract:

In this study, the evolution of field induced mechanisms in lead-free piezoelectric ceramics (1−x)Bi1/2 Na 1/2TiO3-xBaTiO3 with x = 0.06 and 0.07 was investigated by transmission electron microscopy, neutron, and X-ray diffraction. Preliminary investigations revealed a strong degradation of macroscopic electromechanical properties within the first 100 bipolar electric cycles. Therefore, this structural investigation focuses on a comparative diffraction study of freshly prepared, poled, and fatigued specimens. Transmission electron microscopy and neutron diffraction of the initial specimens reveal the coexistence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively. In situ electric field X-ray diffraction reveals a pronounced field induced phase transition from a pseudocubic state to a phase composition of significantly distorted phases upon poling with an external electric field of 4 kV/mm. Although the structures of the two compositions are pseudocubic and almost indistinguishable in the unpoled virgin state, the electric field response shows significant differences depending on composition. For both compositions, the application of an electric field results in a field induced phase transition in the direction of the minority phase. Electric cycling has an opposite effect on the phase composition and results in a decreased phase fraction of the minority phase in the fatigued remanent state at 0 kV/mm.

Journal or Publication Title: Applied Physics Letters
Volume: 106
Number: 22
Uncontrolled Keywords: Piezoelectric fields, Electric fields, X-ray diffraction, Phase transitions, Neutron diffraction
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A1: Manufacturing of ceramic, textured actuators with high strain
11 Department of Materials and Earth Sciences > Earth Science
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 08 Jun 2015 12:38
Official URL: http://dx.doi.org/10.1063/1.4922145
Identification Number: doi:10.1063/1.4922145
Funders: The research leading to these results has received funding from the BMBF (Bundesministerium fuer Bildung und Forschung) (Grant No. 05K13VK1), the Sonderforschungsbereich 595 “Fatigue in Functional Materials”, and from the Feodor Lynen Research Fellowship Program of the Alexander von Humboldt Foundation.
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